Spark-plug.



E. F. HOPKINS.

SPARK PLUG. APPLIGATIO FILED Nox/.28,1Q1o.

mmm@

Patents@ Nav. 1&9, 15H2.

EZB/A IF. HOFKINS, F CHICAGO, ILLINOIS.

En eraan-raue.

Specification of Letters Patent.

'Patented More 1Q, 191%..

Application filed November 2S, 1910. Serial o. 594,421.

To all whom, t may concern: v

Be it known that l, Enna F. Horrrrirs, a citizen of the' United States, residing at Chicago, in the county di Cook and State oi illinois, have invented certain new and useiul improvements in Sparlnllugs, olf which -the following is a specification.

1an annular dange 6 adapted to engage the bushing The object ci this invention is to improve the construction of spark plugs of the type commonly know as the make-and-break type.

ln the accompanying drawings; Figure 1 is a longitudinal. central section through aspark plug embodying the features ci' my invention. Fig. 2 is a section on line 9--2 ot Fig. l. AFig. 3 is a section on line 3--3 of Fig. L

The embodiment herein shown of my in vention comprises a bushing 1 having a screw-threaded .portion 1*L adapted to .be screwed into an engineV frame A and a portion 1b adapted to be engaged by a suitableA .Wrench for turning the bushing.- Within the bushing 1v is a. sleeve 2 of irlsulating material and this sleeve is lined with a thin sleeve 3 o' metal or other Wear-resisting material. f

Sli'dahlymounted in the sleeve 3 is a rod i having a head 5 at one end, said head having thereon an electrode in the :term of' end of the 4bushing 1 and mak-e electrical contact therewith. Said flange has an edge A`which cornes in contact with the bushing and tends to out through any insulating sub stance thatl may collect on either the bushing or the edge of the fange.

'A coiled spring I surrounding the rod "e bears at one end against a washer 8 and at its other end against a nut 9 threaded upon the end of therod,v the spring tending to hold the flange 6 in contact with the 1. The Washer 8 is insulatedfrom the head l of the bushing 1 by means of an insulating Washer 10.

A member 11 fitted upon the rod 4 has a socket l2 thereon adapted to receive a screw `13 for the purpose et connecting an electric Wire (not shoyvn) to the member 1L SaidKw I member is clamped in place by means of a nut 14 threaded upon the rod 4 the nut clamping said member against the nut 9.

As will be seen an electric circuit is estab lished through the member 11, rod llbus' hing 1 and the engine 'frame A, and this circuit isnormally' closed, hut may he broken by sliding the rod l tov carry the electrode 6 ,away trom the end of the bushing 1. Such separation will draw a large spark between said electrode and bushing 1l The spark plug may be operated in any desired manner as by means of a rotary shaft 15 having a cam '16 thereon arranged to engage the lower end of the nut 14 Aand move the rod '4i upwardly. An insulating member 17 may be secured to the nut le to prevent electrical contact `oetWeen the. cam lli and said nut.

l claim as my invention:

l. 'In a spark plug in combination, a bush ing adapted to be screwed into anengine frame, an insulating lining in said bushing, a rod slidable in said lining and having an electrode at one end said electrode having a lange Withen edge thereon, said edge being adapted to engage the end of said bush ing2 and means tending to hold said rod in position vvhere said electrode engages said bushing.

In a. spark plug in combination, a bushing adapted to be screwed into an engine traine; als insulating sleeve Within said bushing; a; rod extending through said sleeve and slidable therein, said rod having a head at one end with a flange thereon, and an edge on said flange, said edge adapted 'to make electrical contact With the end of said bushing; a coiled spring adapted to normally hold said head in such contact; and means :tor insulating .said spring from said bushing.

3. ln an electric ignition device, in oom- 'bination, a bushing adapted to be screwed bushing, with the remainer oi said elec i mandei' of said E061 spaceci away from mici trod@ ouiJ oi' commet with said bushing. l bushing. 10

4. In an electric ignition device, a, bush- En testimony whereof fi my sina ing adapted to be screwed into an engine in presence of two'witnesses.

frame, an insulated rod siidable in said EZR EY HOPKNS.

bushing, a sharp projectilgg edge on said Witnesses:

rod, and means for bringing sgud edge in Mrs. JAMEsvHAEs, Contact with said bushing, Wit-h the re- THOMAS J. Jomsotff 

